<s>
Nibbles	B-Application
,	O
also	O
known	O
by	O
the	O
source	O
code	O
's	O
file	O
name	O
NIBBLES.BAS	B-Application
,	O
is	O
a	O
variant	O
of	O
the	O
snake	B-Application
video	I-Application
game	I-Application
concept	O
used	O
to	O
demonstrate	O
the	O
QBasic	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Nibbles	B-Application
was	O
written	O
in	O
QBasic	B-Language
by	O
Rick	O
Raddatz	O
,	O
who	O
later	O
went	O
on	O
to	O
create	O
small	O
businesses	O
such	O
as	O
Xiosoft	O
and	O
Bizpad	O
.	O
</s>
<s>
The	O
game	O
's	O
objective	O
is	O
to	O
navigate	O
a	O
virtual	O
snake	B-General_Concept
through	O
a	O
walled	O
space	O
while	O
consuming	O
numbers	O
(	O
from	O
1	O
through	O
9	O
)	O
along	O
the	O
way	O
.	O
</s>
<s>
The	O
player	O
must	O
avoid	O
colliding	O
with	O
walls	O
,	O
other	O
snakes	B-General_Concept
or	O
their	O
own	O
snake	B-General_Concept
.	O
</s>
<s>
Since	O
the	O
length	O
of	O
the	O
snake	B-General_Concept
increases	O
with	O
each	O
number	O
consumed	O
,	O
the	O
game	O
increases	O
in	O
difficulty	O
over	O
time	O
.	O
</s>
<s>
There	O
is	O
a	O
multiplayer	O
mode	O
which	O
allows	O
a	O
second	O
player	O
to	O
control	O
a	O
second	O
snake	B-General_Concept
by	O
using	O
a	O
different	O
set	O
of	O
keys	O
on	O
the	O
same	O
keyboard	O
.	O
</s>
<s>
Nibbles	B-Application
was	O
included	O
with	O
MS-DOS	B-Application
version	O
5.0	O
and	O
above	O
.	O
</s>
<s>
Written	O
in	O
QBasic	B-Language
,	O
it	O
is	O
one	O
of	O
the	O
programs	O
included	O
as	O
a	O
demonstration	O
of	O
that	O
programming	O
language	O
.	O
</s>
<s>
The	O
QBasic	B-Language
game	O
uses	O
the	O
standard	O
80x25	O
text	O
screen	O
to	O
emulate	O
an	O
80x50	O
grid	O
by	O
making	O
clever	O
use	O
of	O
foreground	O
and	O
background	O
colors	O
,	O
and	O
the	O
ANSI	B-Protocol
characters	O
for	O
full	O
blocks	O
and	O
half-height	O
blocks	O
.	O
</s>
<s>
Microsoft	O
's	O
24kB	O
QBasic	B-Language
version	O
was	O
copyrighted	O
in	O
1990	O
.	O
</s>
<s>
Because	O
of	O
MS-DOS	B-Application
'	O
s	O
prevalence	O
at	O
that	O
time	O
,	O
it	O
was	O
available	O
on	O
almost	O
every	O
IBM	O
PC	O
compatible	O
in	O
the	O
early	O
1990s	O
.	O
</s>
